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#include <sys/types.h>
#include <sys/socket.h>
#include <unistd.h>
#include <stdio.h>
#include <string.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <errno.h>
#include "my_recv.h" // ×Ô¶¨ÒåµÄÍ·Îļþ
#define SERV_PORT  4507 // ·þÎñÆ÷¶ËµÄ¶Ë¿Ú
#define LISTENQ   12 // Á¬½ÓÇëÇó¶ÓÁеÄ×î´ó³¤¶È
#define INVALID_USERINFO 'n' // Óû§ÐÅÏ¢ÎÞЧ
#define VALID_USERINFO  'y' // Óû§ÐÅÏ¢ÓÐЧ
#define USERNAME  0 // ½ÓÊÕµ½µÄÊÇÓû§Ãû
#define PASSWORD  1 // ½ÓÊÕµ½µÄÊÇÃÜÂë
struct userinfo {   // ±£´æÓû§ÃûºÍÃÜÂëµÄ½á¹¹Ìå
 char username[32];
 char password[32];
};
struct userinfo users[ ] = {
 {"linux", "unix"},
 {"4507", "4508"},
 {"clh", "clh"},
 {"xl", "xl"},
 {" "," "}     // ÒÔÖ»º¬Ò»¸ö¿Õ¸ñµÄ×Ö·û´®×÷ΪÊý×éµÄ½áÊø±êÖ¾
};
// ²éÕÒÓû§ÃûÊÇ·ñ´æÔÚ£¬´æÔÚ·µ»Ø¸ÃÓû§ÃûµÄϱê,²»´æÔÚÔò·µ»Ø-1£¬³ö´í·µ»Ø-2
int find_name(const char *name)
{
 int i;
 
 if (name == NULL) {
  printf("in find_name, NULL pointer");
  return -2;
 }
 for (i=0; users[i].username[0] != ' ';i++) {
  if (strcmp(users[i].username, name) == 0) {
   return i;
  }
 }
 return -1;
}
// ·¢ËÍÊý¾Ý
void send_data(int conn_fd, const char *string)
{
 if (send(conn_fd, string, strlen(string), 0) < 0) {
  my_err("send", __LINE__);  // my_errº¯ÊýÔÚmy_recv.hÖÐÉùÃ÷
 }
}
int main()
{
 int   sock_fd, conn_fd;
 int   optval;
 int   flag_recv = USERNAME; // ±êʶ½ÓÊÕµ½µÄÊÇÓû§»¹ÊÇÃÜÂë
 int   ret;
 int   name_num;
 pid_t   pid;
 socklen_t&


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